Hmmm. I think that the LS and GSR's have a different IM blot pattenr. SO in order to use the GSR supercharger you would have to cahnge the bolt pattern on the supercharger. If you are going ls/vtec the GSR supercharger should work.

another thing. the JRSC for the ls uses the m45 (Smaller) blower, while the GSR uses the m62 (Larger).